Hello,

In case of rotary wagon tippler the material discharge from wagons will have at least 2 m of free fall with respect to hopper inlet (if not, it can be provided in arrangement if need be).

In case of side discharge wagon tippler, the material discharge from wagon will have around 3 to 4 m free fall, with respect to hopper inlet.

The material free fall from aforesaid heights will result into velocity of 22.5 kmph and 27.6 kmph at hopper mouth.

The 55 tonne material falling / impacting with such velocity will sweep away any residue of material in hopper corners/valleys. So, even material like iron ore concentrate cannot accumulate and grow into blockage. At every tip the material in hopper gets renewed. You can opt for hopper valley angle say 55 degree (hopper side walls angle could be around 65 degree to horizontal). This will be adequate to move / sweep away even sluggish material like iron ore concentrate falling under gravity force.

To minimise the liner wear while handling pellets or iron ore, set the feeder discharge rate in tune with unloading rate, such that material is partially present in hopper/s most of the time. This will reduce the material flow velocity in hopper and thereby more life for the liners.

As for the liners type suitable for iron ore, you can take advice from liner manufacturers and choose the liner for compromise between price and replacement interval. Then one has to accept the expense for the liner wear and plant operation.

Ishwar G. Mulani

Author of Book: ‘Engineering Science And Application Design For Belt Conveyors’. Conveyor design basis is ISO (thereby book is helpful to design conveyors as per national standards of most of the countries across world). New print Nov., 2012.

Author of Book: ‘Belt Feeder Design And Hopper Bin Silo’

Advisor / Consultant for Bulk Material Handling

System & Issues.

Pune, India. Tel.: 0091 (0)20 25871916

Email: conveyor.ishwar.mulani@gmail.com

Website: www.conveyor.ishwarmulani.com ■